1. Impurities
Caused by bearings or high-quality cleanliness, an irregular abnormal sound is emitted. The sound is sometimes absent, sometimes large and sometimes small, and occurs frequently on high-speed motors.
Solution: choose good grease, improve the cleanliness before grease injection, strengthen the sealing performance of the bearing, and improve the cleanliness of the installation environment.
2. Da da sound
The sound frequency changes with the bearing speed, and the surface waviness of the parts is the main cause of the noise.
Solution: Improve the surface processing quality of the bearing raceway, reduce the waviness amplitude, reduce the bruise, correct the clearance preload and fit, check the operation of the free end bearing, and improve the precision installation method of the shaft and the bearing seat.
3. Buzzing sound
The motor makes a beeping sound when it is running without load, and the motor vibrates abnormally in the axial direction, and there is a buzzing sound when it is turned on or off.
Solution: It often occurs when the lubrication state is not good, and the motor with ball bearings at both ends in winter is mainly an unstable vibration generated under the influence of axial vibration when the shaft alignment performance is not good.
4. The sound of drizzling
It is caused by the vibration and collision between the cage and the rolling elements. It may occur regardless of the type of grease, and it is more likely to occur when the moment, load, or radial clearance is large.
Solution: Improve the accuracy of the retainer, choose a bearing with small clearance or apply a preload to the bearing, reduce the moment load, reduce the installation error, and choose a good grease.